This container can be pulled via:
  docker pull registry.opensuse.org/opensuse/factory/arm/totest/containers/opensuse/tumbleweed:20190304
  docker pull registry.opensuse.org/opensuse/factory/arm/totest/containers/opensuse/tumbleweed:20190304.5.7
  docker pull registry.opensuse.org/opensuse/factory/arm/totest/containers/opensuse/tumbleweed:latest

Set DOCKER_CONTENT_TRUST=1 to enable image tag verification.